condition mean min max ZT0-3 1.9262350000000001 1.9262350000000001 1.9262350000000001 ZT4-7 1.1880845 1.1880845 1.1880845 ZT8-11 3.59912 3.59912 3.59912 ZT12-15 7.217174999999999 7.217174999999999 7.217174999999999 ZT16-19 5.78492 5.78492 5.78492 ZT20-23 3.407115 3.407115 3.407115